Every now and then I cast an eye about to see the state of the art on photo storage, sharing and backup. Like most of us I have far more digital photos than I know what to do with. For the most part we manage the lot on iPhoto on my wife's iMac. It's getting to the point where iPhoto is struggling to keep up and I've pondered LightRoom, but it's still a tad bit of overkill, I think. For now we just using the various tricks of the trade to boost performance. I think the next step will be to move the iPhoto library to an SSD drive. Time to start saving up!
Given my technical background, one of the biggest things I look for in photo management of all sorts is preservation of metadata. If you are not familiar with photo metadata, you should really acquaint yourself. It's also worth acquainting yourself as to why it's important to separate photo sharing from storage. Whether it's the EXIF data recorded by the camera itself, or supplementary metadata added, sometimes out of band, by management apps (e.g. face matches, titles & descriptions you add yourself in iPhoto or other tools), it's really important that software respect what's there as much as possible, adding layers of metadata non-destructively.
Alas this is one area where cloud photo services fail miserably. I think the most pernicious case of this is Dropbox, which is such a handy service for the most part, but I think is nothing short of evil with regard to photos. First of all it is loud and persistent in pestering you to switch to its photo import and storage module every time you connect a memory card or such to your computer (I understand: they want to nudge people in a direction that leads to paying more for storage.) The problem is that if you make the mistake of succumbing to their come-ons, you'll find that they happily mangle and destroy any photo metadata that precedes them. The comments on their blog entries about the photo features are full of customers complaining about this abuse, but they don't seem to be listening. They are not alone. Google Picassa also mangles metadata. Facebook surprises me by actually trying to do the right thing, and getting a bit tied up in knots as a result.
For now I'm sticking with iPhoto, and I'll copy photos from there to Dropbox, Facebook, etc. as needed for sharing. I'm also trying out AeroFS, and hoping for good things from them, from the general perspective of meddling-free file distribution and sharing. I hope more people get familiar with the issues here (there are real consequences to having your photo metadata mangled), and that it adds up to a voice in the marketplace for better solutions, including on the cloud.